About half of South Africa's gold miners suffer from silicosis, a life-threatening disease caused when silica from gold lodges in the lungs. Now, thousands of gold miners have signed on to the largest class action lawsuit in Africa's history.

About half of South Africa's gold miners suffer from silicosis, a life-threatening disease caused when silica from gold lodges in the lungs. Now, thousands of gold miners have signed on to the largest class action lawsuit in Africa's history.